Adding dynamic named Javascript object to an array with a for loop

Question

Wondering if it is possible to use a loop to add dynamically named objects to an array, so I don't need to repeat the "push" on an array. Tks !!

  let _objA0 = { "name":"regionId", "value":"myRegion" };
  let _objA1 = { "name":"vdcId", "value":"myId" };
  let _objA2 ... _objA100
  
  let test = []
  test.push(_objA0)
  test.push(_objA1)
  ...
  test.push(_objA100)

If it's a matter of not repeating the push you can just do let test = [_objA0, _objA1, ..., _objA100]; The real question though, is why you need to have these dynamically named objects to begin with. — Robby Cornelissen
– Robby Cornelissen, Commented Nov 24, 2020 at 3:26
Tks, we have a "JSON template based" creation flow, where the JSON contains dozens of product attributes. One of the attribute contains an array of objects with dozens of configurations. I need to populate the array with my "prepared objects", and I wish to find something decent. — GreenLake4964
– GreenLake4964, Commented Nov 24, 2020 at 3:32
I have to admit it's a lame ad hoc design in my team and I have little to do to change the design from ground up... — GreenLake4964
– GreenLake4964, Commented Nov 24, 2020 at 3:48

Hao Wu · Accepted Answer · 2020-11-24 03:27:06Z

1

I guess it's the right time to use eval

let test = [];
for(let i = 0; i <= 100; i++) {
  test.push(eval(`_objA${i}`));
}

answered Nov 24, 2020 at 3:27

Hao Wu

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3 Comments

Robby Cornelissen Over a year ago

Is it ever the right time to use eval? I mean, it's all fun and games until someone pushes an XSS exploit into one of your objects... (Not my downvote, btw)

Hao Wu Over a year ago

@RobbyCornelissen The only dynamic variable in this eval is i from the loop, and it's getting the value of a variable, nothing to inject with, which is relatively safe in this case. Although it's discouraged to use it.

Someone Special Over a year ago

its also fun and games until someone decided they will write down all the variables one by one, and decide to convert it to an array. lol, I guess its not a bad time to use eval. I will give u a up.

sonEtLumiere · Accepted Answer · 2020-11-24 03:35:52Z

0

You can access variables (with var keyword) by window object , try this:

var _objA0 = { "name":"regionId", "value":"myRegion" };
var _objA1 = { "name":"vdcId", "value":"myId" };

let test = [];

for(let i = 0; i < 2; i++){
    test.push(window['_objA' + i]);
}

console.log(test)

answered Nov 24, 2020 at 3:35

sonEtLumiere

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2 Comments

Hao Wu Over a year ago

Well, if he can change the let to var in the generating phase, I would suggest just generate an array in the first place...

Robby Cornelissen Over a year ago

This also assumes that the code is executed in a browser context, which is not necessarily a given.

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